Telephone subscriber&#39;s set



Nov. 2, 1943.

G. DEAKIN TELEPHONE SUBSCRIBERS SET 5 Sheets-Sheet l l mnnlll 27 7 1 r I 91 U Lv) )1 kg 4 J) INVENTOR. DJf/M M ATTORNEY.

Nov. 2, 1943. DEAKm TELEPHONE SUBSCRIBERS SET Filed Oct. 30, 1941 5 Sheets-Sheet 2 IN NTOR.

" I TI'ORNEY.

Nov. 2, 1943. G. DEAKIN 2,333,299

TELEPHONE SUBSCRIBERS SET Filed Oct. 30, 1941 5 Sheets-Sheet 3 II III IHI v is *1 W 3 1M 'lu W "Wu. Ill

A TTOHNE'Y.

Nov. 2, 1943. E DEAKIN 2,333,299

TELEPHONE SUBSCEIBERS SET Filed Oct. 50, 1941 5 Sheets-Sheet 4 FIG.6.

2% 25 '28 27 0 63 9 27 I F 29 l 3o I ATTORNEY Nov. 2, 1943. D AK N 2,333,299

' TELEPHONE SUBSCRIBERS SET Filed Oct. 30, 1941 5 Sheets-Sheet 5 F|G.9. FIGJI.

Patented Nov. 2, 1943 TELEPHONE SUBSCRIBERS SET Gerald Deakin, New York, N. Y., assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application October 30, 1941, Serial No. 417,105

' In Belgium November 13, 1940 8 Claims. (Cl. 179100) The present invention relates to telephone subscribers sets and particularly that type of subscriber set which includes within a single unit the ringer, the induction coil, and the condenser and a cradle for reception of a handset unit.-

The invention still more particularly relates to such handsets which are suitable for use as desk sets.

It is an object of the present invention to provide such a subscribers set wherein the interconnections between separate electric circuit components are made with a minimum number of wires.

It is another object to provide such subscribers set wherein substantially all of the interconnections are made with the aid of a cross-connection block to which the terminals of the separate circuit components are connected without intervening wires.

In particular, it is an object to provide such subscriber set wherein the connections between the cradle operated spring assembly and substantially all of the following components: condenser, induction coil, ringer, line cord, and handset cord, are effected by the aid of a rigid interconnection block to which said spring assembly and substantially all of said other components are rigidly attached.

It has already been proposed to interconnect the cradle operated contact spring assembly and the several other electric components above referred to by the aid of an interconnection block which is secured to the base-plate of a telephone subscribers set and to which in turn the spring assembly and the other components were rigidly attached, thus attaining in a more or less satisfactory manner the above listed objects of the present invention. In such proposed arrangement, however, the attachment of the spring assembly to the interconnecting block, which in turn was attached to the base-plate, necessitated the separation of this spring assembly from the main housing of the subscribers set whenever the base-plate was removed for inspection of the interior. To avoid separation of the spring assembly from the cradle plunger mechanism which normally actuated it, it was therefore necessary to support at least the moving parts of the cradle mechanism from the base independently of the housing of the subscribers set. This was accomplished in the previously proposed arrangement by constructing the cradle mechanism separate from the outer casing or housing and supporting this mechanism on a bracket from the base-plate.

In similar fashion, the dial which is required in subscribers sets for use in automatic exchanges, was arranged to be supported by a bracket from the base-plate and to extend up to the housing without any mechanical connection to the latter.

The present invention is intended to be an improvement upon the previously proposed arrangement and is intended to provide an alternative improved type of telephone subscriber's set wherein the objects heretofore mentioned shall be attained without the necessity of supporting cradle mechanism independently of the housing or casing while still retaining the advantage that the cooperation between the cradle mechanism and the cradle operated springs may be readily inspected and checked when the base-plate and covered mechanism have been separated to allow ready access to the interior equipment.

It is also an object of the present invention to provide a subset containing all of the abovementioned advantages but in addition being of exceedingly dust proof construction.

It is a further object to obtain all of the above advantages in a subset wherein all of the principal component parts shall be supported from the housing or casing of the subset.

It is a further object to provide a subset having all of the advantages hereinbefore mentioned while at the same time insuring a cheap and simple construction of the casing itself so that in the event of breakage of such casing only a minimum part of the total value of the subset will be scrapped.

It is a further object to provide such subset wherein, in the event of a breakage of the casing, all of the circuit components may be transferred to another subset casing without need for soldering or unsoldering any connections.

It is a further object to provide such a casing wherein such advantages can be obtained even when a dial and/or a PBX button is provided.

Other objects and advantages of the invention will appear from the following description taken in connection with the drawings wherein Fig. 1 shows a plan view of a telephone instrument, according to the present invention;

Fig. 2 is a view showing the configuration of the interior of the casing for the instrument;

Fig. 3 is a vertical section;

Fig. 4 is a sectional showing of the arrangement for attaching a PBX button to the instrument;

Fig. 5 is a view of the interior of the instrument with the base plate removed;

means for the spring nest. V

The casing In as shown in the various figures of the drawings, particularly- Figures- 1- and- 2 is made of a suitable plastic materiallor a-metal preferably molded into form: The casing cornprises a base portion ll, abovea'iforwardpart of? which is a slanting surface !2 having a. recess. [3? for dial mechanism I4. Over the rear portion. of.

the base is a cradle supporting part l5'projecting upward-lyxabovethe dial mechanism-provided with twoIpai-rsof arms Iii-and l lwhioh serve-as a cradle for atelephonehandset;

Between the:cradle-arms-. the casing has asubstantially oblong recess 20, connecting with'a dependingtube 2- l the rear part of the upmr portion. of the" tube, Fig. 3 forming part of a wall of the casing.

The casingisprovided in a number of places with threaded. studs-which are put into the casing; during themolding. process- The various components making up. thetelephoneset are secured} except in. the. case. of the. dial mechanism, to the. casing by means. of. such thr.eaded.members..

Referring; to Figs. 2; 3. and 5. The bottom of the-casing. is closed by a base late l9, preferably of metal, secured" by screwslzdjone of which is shown in t'he drawings", to three. tlireadedstuds. 26 molded'intotthercasing. j

On oppositesides'ofjthe casing and Within=the base portion; a pair of moldings 21 are formed provided with; fourthreaded. studs 28'. An approximately oblon'g' shapedshelf or interconnectbig block 29 is secured'tost'uds 28 by screws 3!). A'n opening'3l for afcradle operated plunger 22 is providedinfihterconnecting block 2 9*which is inreg'ister'with the opening in plunger tube 2 I 111' Fig. 3 th'eend' 32 of 'thetube is shown proiecting into a cc-axial circular recess-33 formed on thetupperi'surface of theinterconnectin'g block while. a ilang'eh M proje'cts upward byfrom; the block-r at short distance into: thev tapered' interior of the tube. This arrangement priovid'es a'i dust trap: betlweenatheseapartsa.

Ala cross; member: is? formed at the top) of cradle? plunger" 22: Mid? is. free: to: moveup. and downzim recess? 29;. the plunger memben'being: rettained in thewasing; a'screw28: which enters a. longitudinal: slot 24- in: the; plunger. 'Spring 3% disposedi between shoulderr38" on the plunger and; at ring 39: formed on the-:intenor'of tube: 2.1 is-sefiectivertor raise-the plungerwheni the handset is: removed: from th'ecradle; butt normally the spring is oompressed by the weight; of, the handset. while: resting in' the" cradle; and: then the plunger; projects beyond the. lower surface of theiinteroonnectingtbloeh operating a contact arrangement soon to be described- The-upper 'part of the plunger passes througha'soft washerlflfof felt on. the like; and the lower part-thereof passes throughia similar washer 4i held between rings 39 and 42. This arrangement keeps out dust and serves. to. guide plunger 22 independently of the opening in theinterconnecting bloeli: 292

. l0 Fig. 12 shows a modification of the connecting rubber blo Secured to the under surface of interconnecting block 29 by screws is an oblong casing 36 on opposite outer surfaces of which are ridges 41 which serve to retain a removable metal cover 48 provided with beaded surfaces 49 which snap over ridges 41. Within the casing are disposed two sets of contacts 50 and .5l.mounted so that the ends thereof are engaged by'the tapered end 52 of plunger 22, the contacts being mounted at an angle corresponding approximately to the angle of taper of the end of the plunger. With this arrangement; the tongue members of the respective sets are moved to one side or the other according to whether the plunger is depressed or elevated. Theicontacts are shown schematically nest may be removed c-rrreplaced without: disconnecting wires.

Ilelephone cords. 55 and i 5 6'. pass through openings 51 and 58, respectively, near the bottomof the; casing. Dust" is excluded. from these openings" bymeans of' blocks 5!, Fig.2 6, of soft rubber or. the-like which. fit snugly around. the cord securedby'upright; strips, not shown to the base plate. The hols 'are large enough for apair' of cords, required by certain telephon administra tions,- and'iii this ca'se a'suitable' arifoun'tof the may beout ojfitd permit the in"- sertion of a se'cond cord- The cordEn'iay be provided with tips in whichcase' the terminals'may be connected"- directly tothe proper'circuits' by mea ns of the appropriate screws til which are screwed into threaded studs molded'into in terconnectingblock 29, having. connecting. terminals on theupper surface of the interconnecting blockbearing the samereference. characters, to more" easily: trace the. circuit arrangement.

L In. the event.thatthesoecalled untippedcords are tojbecfo'nnec'ted} connecting blocks. SE-and 6,! maybe used. These. blocks ar provided witha channel, to. receive. the. ends of the cords. The channel is. with. three,- grooves: in each; of which is.a.meinber.having teeth that project up? Wardly into. the. channel, there being one memher. in each channel.. Said members are formed withvv extensions 68. which, can be secured by screws-6l165- tothe. telephone circuits. Each block. is: provided with a clamping member 69 which is. pressed down on the toothed members by screws 'lllv to. cause the teeththereof to penetrate the. insulation. of. the cord and engage the conductors thereof and also to clamp the cord securely in the connecting: block.

A-. condenser provided; with a casing H. fil1ed with'asealingcompound is secured at one. end by screw 13 to tapped stud 14" imbedded" in molding 15. formed: on the casing; while the oppositeend of the condenser structure is secured by condensen terminal; lugs 16: and 1'1- and screws 18 anda'lfif, respectively, to. tapped studsimbedded in block- 29, V Thesestuds, areiprovided witha connections on the upper surface of block 29 which bear the same reference characters as the screws.

An induction coil is contained in a casing 8!! also sealed with a suitable sealing compound. One end of the casing is secured by screw 8I to a threaded stud 82 imbedded in molding 83 in the casing while four terminals projecting from the opposite end of the casing are fastened to threaded studs imbedded in block 29 by screws 84, 85, 86 and 81.

A ringer assembly is supported by screws 88 and 89 fastened to threaded studs in moldings 90 and SI, respectively. The ringer is supported by a plate 92 having a depending flange 93 supporting magnets 94. A bar 95 projecting from flange 93 carries a pivot 95 on which armature 91 and striker arm 98 are pivotally supported. Armature spring 99 is connected between the armature and one of a series of notches in flange 93 by which the spring is adjusted. The ma nets are provided with connecting lugs I88 and IUI connected by screws I02 and I03 to studs imbedded in interconnecting block 29. The studs bear the same reference characters as the corresponding screws.

A preferred form of dial mechanism I4 for use with a telephone set according to the present invention is provided with a series of contact studs III to I I4 by means of which the dial mechanism may be removably connected to external circuits without the necessity of unfastening wires. The contact studs engage corresponding contact springs H5 to H8, respectively, mounted on a plaque II9, Figs. 8 and 9, of insulating material. The plaque has an approximately oblong shape, one end, I28 being slightly curved to insure that the plaque will always be put in its receptacle in the proper position.

At the bottom of recess I3 is an opening I2I shaped to receive the plaque, the flanged edge of the plaque resting on a flange I22 around the edge of opening I2I. This arrangement aids in excluding dust and also holds the plaque in position. As shown in Fig. 3, dial contacts IIII I4 engage plaque contacts II5I I8 and the dial is retained in the recess by means of screws I and I26, the heads of which are accessible from the bottom of the instrument. With this arrangement the dial assembly can be removed without disconnecting any wires, by unscrewing the two screws referred to. Small holes I23 and I24 are provided optionally in plate I9 located so that a screw driver may be inserted to remove these screws and with this arrangement the dial can be removed without first removing base plate I 9.

A ring I of synthetic rubber is provided between an edge of the dial assembly and the edge of the casing to exclude dust.

Where required the instrument may be provided with a PBX button which is also removably secured to casing I8. For this purpose a hole I is provided in the front of the casing below the dial from which projects a PBX button I36, Fig. 4. The button comprises a plunger I31 on which is disposed compression spring I38. A contact disc I39 is secured on the plunger and when the button is depressed the contact disc engages and closes a circuit between two contact pins I48 and I 4| imbedded in a bracket I 42 of insulating material which supports the button assembly, the bracket being secured by means of screw I 43 to a threaded stud imbedded in the casing,

Figure 10 shows how the various components are connected in a conventional telephone circuit Which includes the PBX button I36. Th circuit is obvious to those skilled in the art and, therefore, it is not thought necessary to describe the same since it is not part of the present invention. It will be noted that with the exception of those for the dial and the PBX button which is not regular equipment, all circuits are interconnected on the top surface interconnecting block 29 and that all components can be attached or removed with the aid of a screwdriver. The latter statement applies when a spring nest of the kind shown in Fig. 12 is used. The circuits are interconnected by any suitable means for establishing connections from stud to stud, such as by wires or bus bars imbedded in the interconnecting block.

Contacts I I5I I8 on plaque II9 are connected to the interconnecting block circuits by flexible insulated wires of suflicient length to permit the plaque to be partially lifted out of its seat and then dropped end ways through opening I2! into the interior of the casing. This feature makes it possible to remove all elements from the casin without interfering with wire connections, because the plaque and the interconnecting block may be removed together with or without detaching other components from the casing by removing the various screws securing the interconnecting block.

A prime advantage of the invention resides in that by removing base plate I9 and spring nest cover 48, spring assemblies 58 and 5| may be inspected while all parts are in their normal working position. Other elements may be replaced with the aid of a screw driver, and the respective elements are so disposed that one element may be removed without disturbing the other elements.

The exterior of the casing is so shaped that the instrument cannot readily be lifted by one hand unless the fingers of either hand are closed around a slanting ridge I50 formed as a grip at the back of the instrument. In so doing, the thumb naturally closes down over the handset in the cradle holding the same in position. This feature is designed to reduce the amount of breakage of handsets which is largely due to their falling out of the cradle when the instrument is moved.

In order not to muffle the sound of the ringer, perforations, not shown, covered with a suitable thin fabric to exclude dust may be provided in base plate I9.

Although but one form of the present invention is shown and described, it will be understood that other embodiments thereof will suggest themselves to those skilled in the art without departing from the spirit and scope of the invention as described in the following claims.

What is claimed is:

1. In a telephone subset, a casing, comprising a hollow shell formed with an open base portion, a plurality of moldings formed on the interior of said shell, threaded stud means formed in the respective moldings, a shelf comprising an interconnecting block extending but part way across said base portion and secured by screws from the under side thereof to the threaded stud means in moldings on opposite sides of said shell, a plurality of subset components comprising a ringer, an induction coil and a condenser, each component being provided with connecting lugs secured by screws passing through said lugs into threaded studs connected to appropriate circuits on said connecting block and by means of other screws extending upwardly into the lug means in individual ones of said moldings, a plunger 4 cr a ed new ,a ,hand" et eradi sea extending through said shelf and a springne t; disposed (tithe undersi e of said shelf controlled by the operation 'o'fsald plunger;

2. An arraxi' ement for dial circuits in atelepee" "subset ccmprisin a casing, are ess formed in said casing to hold a telephone; dial, an opening in saidre'cess, a plate bf insulating material shaped as to beretained in said opening disposed therein, a plurality of contact members ind nted 0: 5am late, flexible circuit means from W'ithiri' said casing connected to said, Contact members, said plate being detachable from said casin'g While said flexible circuit means; are congaging the contact members qn s a1d sateen; means to hold said dial mechanism in a fixed predetermined position in said recess. 1 1 n W 5. An arrangement for dial circuits according to claim 2 in which said plate is shaped to fit said opening in but one position. H l p p t n 6. An arrangement for dlal circuits according to claim 2 in which said plate and said opening are provided with overlapping flanges td retain the plate in position. i

'7. An arrangement for dial circuits according to claim 2 including a dial mechanism provided with contacts on the casing thereor disposed in said recess, and means for detachablynoldin g said contacts against the contacts easements comprising screws extending upwardly through the casing and fastened to said dial mechanism;

8. A telephone subset according to claim 1, also comprising a tube in said casing in which said plunger slides, the end of said tube bein formed with a projection which fits into a cii cular recess formed in the upper surface of the said shelf in order to prevent the entry of dust into the casing through said tube.

GERALD DEAiiiiI 

